Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Control Module Communication Bus "A" Off (U0073,U0155)

DESCRIPTION

These DTCs are stored when the clearance warning ECU assembly cannot receive and recognize several signals via the CAN communication line.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0073	Control Module Communication Bus "A" Off	Control module communication bus off	CAN communication system
U0155	Lost Communication with Instrument Panel Cluster (IPC) Control Module	Lost communication with the combination meter assembly	CAN communication system

HINT:

When 2 or more DTCs starting with "U" are output simultaneously, inspect the connectors and wire harnesses of each ECU.

PROCEDURE

1.	CHECK DTC OUTPUT

(a) Clear the DTCs

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

(b) Check for CAN communication system DTCs

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

Result	Proceed to
CAN communication system DTCs are output	A
No CAN communication system DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Lin Communication System(for Gasoline Model): Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION The main body ECU (multiplex network body ECU) and certification ECU (smart key ECU assembly) control the LIN communication system. LIN communication system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3). When the system see ...

Toyota Avalon (XX50) 2019-2022 Owners Manual